The message was supposed to direct parents to the Illinois Board of Education website, at ISBE.net. Instead, an errant "L" in the Web address ushered visitors to a "private invite-only space for women over 18."

CPS spokeswoman Becky Carroll said the error was unintentional.

"As soon as it was brought to our attention we sent out a letter with a corrected link, and apologized for any inconvenience it may have cause," she said, according to the Chicago Sun-Times.

The owner of the erotic site told the Sun-Times she did get some new sign-ups from the unexpected surge in traffic.